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dc.contributor.authorRampe, E. B.
dc.contributor.authorBristow, T. F.
dc.contributor.authorMorris, R. V.
dc.contributor.authorMorrison, S. M.
dc.contributor.authorAchilles, C. N.
dc.contributor.authorMing, D. W.
dc.contributor.authorVaniman, D. T.
dc.contributor.authorBlake, D. F.
dc.contributor.authorTu, V. M.
dc.contributor.authorChipera, S. J.
dc.contributor.authorYen, A. S.
dc.contributor.authorPeretyazhko, T. S.
dc.contributor.authorDowns, R. T.
dc.contributor.authorHazen, R. M.
dc.contributor.authorTreiman, A. H.
dc.contributor.authorGrotzinger, J. P.
dc.contributor.authorCastle, N.
dc.contributor.authorCraig, P. I.
dc.contributor.authorDes Marais, D. J.
dc.contributor.authorThorpe, M. T.
dc.contributor.authorWalroth, R. C.
dc.contributor.authorDowns, G. W.
dc.contributor.authorFraeman, A. A.
dc.contributor.authorSiebach, K. L.
dc.contributor.authorGellert, R.
dc.contributor.authorLafuente, B.
dc.contributor.authorMcAdam, A. C.
dc.contributor.authorMeslin, P.‐Y.
dc.contributor.authorSutter, B.
dc.contributor.authorSalvatore, M. R.
dc.date.accessioned2021-04-17T01:29:41Z
dc.date.available2021-04-17T01:29:41Z
dc.date.issued2020-09-24
dc.identifier.citationRampe, E. B., Bristow, T. F., Morris, R. V., Morrison, S. M., Achilles, C. N., Ming, D. W., ... & Salvatore, M. R. (2020). Mineralogy of Vera Rubin Ridge from the Mars Science Laboratory CheMin Instrument. Journal of Geophysical Research: Planets, 125(9), e2019JE006306.en_US
dc.identifier.issn2169-9097
dc.identifier.doi10.1029/2019je006306
dc.identifier.urihttp://hdl.handle.net/10150/657796
dc.description.abstractVera Rubin ridge (VRR) is an erosion-resistant feature on the northwestern slope of Mount Sharp in Gale crater, Mars, and orbital visible/shortwave infrared measurements indicate it contains red hematite. The Mars Science LaboratoryCuriosityrover performed an extensive campaign on VRR to study its mineralogy, geochemistry, and sedimentology to determine the depositional and diagenetic history of the ridge and constrain the processes by which the hematite could have formed. X-ray diffraction (XRD) data from the CheMin instrument of four samples drilled on and below VRR demonstrate differences in iron, phyllosilicate, and sulfate mineralogy and hematite grain size. Hematite is common across the ridge, and its detection in a gray outcrop suggest localized regions with coarse-grained hematite, which commonly forms from warm fluids. Broad XRD peaks for hematite in one sample below VRR and the abundance of FeO(T)in the amorphous component suggest the presence of nanocrystalline hematite and amorphous Fe oxides/oxyhydroxides. Well crystalline akaganeite and jarosite are present in two samples drilled from VRR, indicating at least limited alteration by acid-saline fluids. Collapsed nontronite is present below VRR, but samples from VRR contain phyllosilicate with d(001) = 9.6 angstrom, possibly from ferripyrophyllite or an acid-altered smectite. The most likely cementing agents creating the ridge are hematite and opaline silica. We hypothesize late diagenesis can explain much of the mineralogical variation on the ridge, where multiple fluid episodes with variable pH, salinity, and temperature altered the rocks, causing the precipitation and crystallization of phases that are not otherwise in equilibrium.en_US
dc.language.isoenen_US
dc.publisherAMER GEOPHYSICAL UNIONen_US
dc.rights© 2020. The Authors. This is an open access article under the terms of the Creative Commons Attribution License.en_US
dc.rights.urihttps://creativecommons.org/licenses/by/4.0/en_US
dc.subjectMarsen_US
dc.subjectCheMinen_US
dc.subjectX-ray diffractionen_US
dc.subjectGale crateren_US
dc.subjectaqueous alterationen_US
dc.titleMineralogy of Vera Rubin Ridge From the Mars Science Laboratory CheMin Instrumenten_US
dc.typeArticleen_US
dc.identifier.eissn2169-9100
dc.contributor.departmentUniv Arizona, Dept Geoscien_US
dc.identifier.journalJOURNAL OF GEOPHYSICAL RESEARCH-PLANETSen_US
dc.description.noteOpen access articleen_US
dc.description.collectioninformationThis item from the UA Faculty Publications collection is made available by the University of Arizona with support from the University of Arizona Libraries. If you have questions, please contact us at repository@u.library.arizona.edu.en_US
dc.eprint.versionFinal published versionen_US
dc.source.journaltitleJournal of Geophysical Research: Planets
dc.source.volume125
dc.source.issue9
refterms.dateFOA2021-04-17T01:29:42Z


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© 2020. The Authors. This is an open access article under the terms of the Creative Commons Attribution License.
Except where otherwise noted, this item's license is described as © 2020. The Authors. This is an open access article under the terms of the Creative Commons Attribution License.